Dumbbell



FIG. 1 is a perspective view of the dumbbell of the present invention;

FIG. 2 is a side view of the dumbbell of FIG. 1, the other side viewbeing an identical image; and,

FIG. 3 is an end view of the dumbbell of FIG. 1, the other end viewbeing an identical image.

CLAIM The ornamental design for the dumbbell, as shown and described.